Terminal device and charging control method

1. A control apparatus comprising: a memory that stores predetermined stored data values; a solar battery panel; a panel temperature detector configured to detect a temperature measured adjacent to the solar battery panel; a power generation-state determiner configured to detect an illuminance measured adjacent to the solar battery panel; a battery temperature-detector configured to detect a temperature measured adjacent to a secondary battery charged by power generated by the solar battery panel; and a controller configured to estimate a change in the temperature detected through the battery temperature-detector based on the temperature detected by the panel temperature-detector and the illuminance obtained by the power generation-state determiner, and determine a remaining time until the estimated temperature measured adjacent to the secondary battery reaches a temperature at which the charging of the secondary battery is stopped by comparing the temperature detected by the panel temperature-detector and the illuminance obtained by the power generation-state determiner with the predetermined stored data values.

2. The terminal device according to claim 1 , wherein the controller determines the remaining time at regular timer intervals.

3. The terminal device according to claim 1 , further comprising: a display configured to display a notification of the remaining time.

4. The terminal device according to claim 3 , wherein the display displays notification information that the charging has been stopped when the charging is stopped.

5. The terminal device according to claim 1 , further comprising: an audio speaker configure to output an audible indicator of a notification of the remaining time.

6. The terminal device according to claim 5 , wherein the audio speaker is configured to output an audible indicator of that the charging has been stopped when the charging is stopped.

7. The terminal device according to claim 1 , wherein when the temperature measured adjacent to the secondary battery at which the charging of the secondary battery needs to be stopped is set to a value near a highest of values falling within a range where the secondary battery is safely charged.

8. The terminal device according to claim 1 , wherein when the time taken for the secondary battery to be fully charged is estimated to be shorter than the time taken before the estimated temperature measured adjacent to the secondary battery reaches a temperature at which the charging of the secondary battery is stopped, the controller uses the time taken for the secondary battery to be fully charged as the remaining time.

9. The terminal device according to claim 1 , wherein when the battery temperature-detector detects that the temperature measured near the secondary battery is not at the temperature at which the charging of the secondary battery is stopped, the battery temperature detector temporarily stops before taking a next measurement of the temperature adjacent to the secondary battery.

10. The terminal device according to claim 1 , further comprising: a light-emitting diode configured to emit light indicating when a notification is provided about the remaining time.

11. A method, implemented on a control apparatus having a solar battery panel and a secondary battery that is charged by power generated by the solar battery panel, comprising: detecting a temperature measured adjacent to the solar battery panel; detecting an illuminance measured adjacent to the solar battery panel; detecting a temperature measured adjacent to the secondary battery; and estimating a change in the temperature measured adjacent to the secondary battery based on the temperature measured adjacent to the solar battery panel and the illuminance measured adjacent to the solar battery panel, and determining a remaining time until the estimated temperature measured adjacent to the secondary battery reaches a temperature at which the charging of the secondary battery is stopped by comparing the temperature measured adjacent to the solar battery panel and the illuminance measured adjacent to the solar battery panel with predetermined stored data values that are stored in a memory of the control apparatus.

12. A non-transitory computer readable storage medium that stores a program which, when executed by a control apparatus having a solar battery panel and a secondary battery that is charged by power generated by the solar battery panel, causes the control apparatus to perform a method comprising: detecting a temperature measured adjacent to the solar battery panel; detecting an illuminance measured adjacent to the solar battery panel; detecting a temperature measured adjacent to the secondary battery; and estimating a change in the temperature measured adjacent to the secondary battery based on the temperature measured adjacent to the solar battery panel and the illuminance measured adjacent to the solar battery panel, and determining a remaining time until the estimated temperature measured adjacent to the secondary battery reaches a temperature at which the charging of the secondary battery is stopped by comparing the temperature measured adjacent to the solar battery panel and the illuminance measured adjacent to the solar battery panel with predetermined stored data values that are stored in a memory of the control apparatus.